Fix the multiselect highlight issue

filter.go

@@ -89,12 +89,15 @@ func RenderHelp(s *State, inputs Items) {
 
 func RenderMain(s *State, inputs Items) {
 	y := 2
-	status := fmt.Sprintf("[Line: %d][? For help]: %s", s.Current+1, s.UserInput)
+	//status := fmt.Sprintf("[Line: %d][? For help]: %s", s.Current+1, s.UserInput)
+	status := fmt.Sprintf("L: %d, U: %d, S: %d [Line: %d][? For help]: %s", s.LowerBound, s.UpperBound, s.SelectionStartLine, s.Current+1, s.UserInput)
 	drawText(*s.Screen, 0, 0, xmax-1, 1, helpStyle, status)
 	drawText(*s.Screen, len(status), 0, xmax-1, 1, cursorStyle, "⎥")
+
 	for i, item := range (*inputs)[s.LowerBound:s.UpperBound] {
 		style := tcell.StyleDefault
 		arrowStyle := normalArrow
+		index := s.LowerBound + i
 
 		var txt string
 
@@ -110,14 +113,14 @@ func RenderMain(s *State, inputs Items) {
 		}
 
 		if s.InSelectionMode {
-			if (s.SelectionStartLine < s.LowerBound && i <= s.Current) || (s.SelectionStartLine > s.UpperBound && i >= s.Current) {
+			if (s.SelectionStartLine < s.LowerBound && index <= s.Current) || (s.SelectionStartLine > s.UpperBound && index >= s.Current) {
 				style = selectionStyle
 				arrowStyle = selectionArrow
 			} else {
 				low := min(s.SelectionStartLine, s.Current)
 				high := max(s.SelectionStartLine, s.Current)
 
-				if i >= low && i <= high {
+				if index >= low && index <= high {
 					style = selectionStyle
 					arrowStyle = selectionArrow
 				}
@@ -191,6 +194,8 @@ func HandleMain(state *State, ev tcell.EventKey, input Items) {
 
 	} else if ev.Key() == tcell.KeyCtrlH {
 		state.CurrentScene = 1
+	} else if ev.Key() == tcell.KeyBackspace {
+		state.UserInput = string(state.UserInput[:len(state.UserInput)-2])
 	} else {
 		state.UserInput = state.UserInput + string(ev.Rune())
 	}

utils.go

@@ -23,9 +23,8 @@ import (
 )
 
 type Item struct {
-	Text      string
-	Selected  bool
-	Highlight bool
+	Text     string
+	Selected bool
 }
 
 type Items = *[]*Item